Quiz & test questions Grade 7 Careers & CTE

Shift Handoff at Ravensmill: A Water Reclamation Careers Quiz

A grade 7 careers quiz on the roles, records, and percent math of one overnight shift at a fictional water reclamation plant, with a nine-item key.

Grade: Grade 7
Subject: Careers & CTE
Material: Quiz & test questions
Time: 35 min
Prep: No prep
Materials: calculator

Standards

7.RP.A.3 Common Core Math

Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.

How this material aligns: Items 4 and 6 ask students to find a percent removed and a percent increase from the plant's own log values, which is the multistep percent work this standard names.

All materials for 7.RP.A.3 →

7.NS.A.3 Common Core Math

Solve real-world and mathematical problems involving the four operations with rational numbers.

How this material aligns: Item 9 asks students to turn a decimal flow in million gallons per day into whole gallons, and the key names the place-value error that makes the answer ten times too small.

All materials for 7.NS.A.3 →

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This material is in the public domain (CC0) and may be copied, edited, and shared freely, without attribution. Updated 2026-09-23.

Objectives

Students will identify the records and licenses a plant operator is responsible for.
Students will calculate percent removal and percent increase from shift log values.
Students will explain why laboratory and compliance staff share responsibility for a permit.

Vocabulary

Influent: Influent is the incoming dirty water that arrives at a treatment plant, ready to be cleaned. Operators test it to see how much work the plant has to do.
Effluent: Effluent is the cleaned water that leaves a treatment plant at the end of the process. It is tested carefully before being released to a river, lake, or the ocean.

Also: shift handoff, operator license, permit, compliance

Teacher overview

This 35-minute quiz is worth 24 points. It mixes three multiple-choice items, four computation items, and two short-answer items, all drawn from one night's log at the fictional Ravensmill Water Reclamation Facility. Meeting a discharge permit is shared work rather than one operator's call. The laboratory analyst runs the tests, the compliance coordinator files the report the state reads, and the operator's handoff log is the record that ties the three jobs together.

Shift Handoff at Ravensmill: A Water Reclamation Careers Quiz — Grade 7 Careers & CTE

Name: ____________________________ Date: ______________

Assessment

Shift notes. The fictional Ravensmill Water Reclamation Facility treats wastewater for a town of about 12,000 people. One operator works the overnight shift alone, and every figure below was invented for this quiz.

Flow treated Tuesday: 0.60 MGD. Flow treated Wednesday: 0.75 MGD.
Wednesday influent BOD: 240 mg/L. Wednesday effluent BOD: 27 mg/L.
2:10 a.m.: the return sludge pump tripped. The operator reset it, and it ran normally after that.
4:30 a.m.: samples collected and iced for the laboratory analyst.

(2 points) Which record must the overnight operator finish before leaving at the end of the shift?
- A) A purchase order for treatment chemicals
- B) A shift handoff log describing what happened
- C) A customer's monthly water bill
- D) A job application for the next opening
(2 points) How does a water or wastewater operator usually earn a state license?
- A) By paying a yearly fee
- B) By passing a state exam after documented hours on the job
- C) By finishing a four-year degree and nothing else
- D) By being recommended by a supervisor
(2 points) State operator licenses are issued in classes. What are those classes tied to?
- A) The age of the operator
- B) The size of the plant and the operator's experience
- C) The county the plant sits in
- D) The number of chemicals the plant stores
(3 points) On Wednesday the fictional Ravensmill plant measured influent BOD of 240 mg/L and effluent BOD of 27 mg/L. What percent of the BOD was removed? Round to the nearest tenth of a percent.
(3 points) Secondary treatment standards set a monthly average effluent BOD of 30 mg/L or less. Wednesday's effluent BOD was 27 mg/L. Does that single result sit at or below the 30 mg/L figure?
(3 points) The fictional plant treated 0.60 MGD on Tuesday and 0.75 MGD on Wednesday. What was the percent increase in flow from Tuesday to Wednesday?
(3 points) At 2:10 a.m. the return sludge pump tripped, and the operator reset it. Name two things the handoff log should say about that event.
(3 points) The plant's permit is written as a monthly average. Explain in two sentences why one good day does not prove the plant is meeting its permit.
(3 points) On Wednesday the fictional plant treated 0.75 MGD. How many gallons of wastewater is that?

From Water for Schools (waterforschools.org). This material is in the public domain (CC0) and may be copied, edited, and shared freely.

Answer Key

Answer: B) A shift handoff log describing what happened.
The handoff log is how the next operator learns what ran, what failed, and what was sampled. Choices A, C, and D name real utility paperwork, yet none of them is the operator's end-of-shift record.
Answer: B) By passing a state exam after documented hours on the job.
Operators typically need a high school diploma, on-the-job training, and a state license earned by exam. Choice C is the common misconception, because a four-year degree is one route into the water sector but not the route into an operator license.
Answer: B) The size of the plant and the operator's experience.
Licenses run in classes, and the class an operator holds has to match the plant they are responsible for.
Answer: 88.8 percent.
The amount removed is 240 mg/L minus 27 mg/L, which is 213 mg/L. Divide by the influent value: 213 divided by 240 equals 0.8875. As a percent that is 88.75, which rounds to 88.8 percent.
Answer: Yes.
Wednesday's 27 mg/L is 3 mg/L below the 30 mg/L figure, so that day's result sits under it. Accept any answer that states yes and compares the two numbers.
Answer: 25 percent.
The increase is 0.75 minus 0.60, which is 0.15 MGD. Divide by the starting value: 0.15 divided by 0.60 equals 0.25, which is 25 percent.
Answer: Accept any two of the following.
The time the pump tripped, what the operator did about it, whether the pump ran normally afterward, whether an alarm cleared, and what the next shift should watch. A note that says only "pump problem" does not tell the next operator what to check.
Answer: Accept any explanation of averaging.
A monthly average is built from many results, so one low day can sit beside several high days and still average above the figure. The operator has to keep sampling and logging all month before anyone can say the plant met the permit.
Answer: 750,000 gallons.
MGD means million gallons per day. Multiply 0.75 by 1,000,000 to get 750,000 gallons. A student who answers 75,000 has moved the decimal one place too few, which is the most common error on this item.

Differentiation

Support

Give these students a worked model of item 4 using different numbers from the same fictional plant, showing the subtraction, the division, and the move to percent as three labeled steps. Allow a calculator for every computation item, and let items 7 and 8 be answered in a bulleted list rather than sentences.

Extension

Ask these students to write the full handoff log entry for the fictional 2:10 a.m. pump trip as an operator would leave it, then to name which of the three jobs in this quiz would read that entry next and what each one would do with it.

ELL supports

Pre-teach influent, effluent, permit, handoff, and compliance with one short definition and one example each, using arrows to show water entering and leaving the fictional plant. Provide a sentence frame for item 8: "One good day is not enough because a monthly average uses ___, so ___."

Extensions

Ask students to find the annual water quality report published by their own community's utility and to list which job title signed or prepared it. A short discussion can then compare that real signature line with the three fictional Ravensmill roles named in this quiz.